CN201382823Y - Temperature measuring circuit of quick heating body of coffee machine - Google Patents
Temperature measuring circuit of quick heating body of coffee machine Download PDFInfo
- Publication number
- CN201382823Y CN201382823Y CN200920301894U CN200920301894U CN201382823Y CN 201382823 Y CN201382823 Y CN 201382823Y CN 200920301894 U CN200920301894 U CN 200920301894U CN 200920301894 U CN200920301894 U CN 200920301894U CN 201382823 Y CN201382823 Y CN 201382823Y
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- resistance
- operational amplifier
- temperature sensor
- temperature
- resistor
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 210000000476 body water Anatomy 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 206010013911 Dysgeusia Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The utility model relates to a temperature measuring circuit of a quick heating body of a coffee machine, which comprises a single chip microcomputer (1) used for executing the detection algorithm and a temperature sensor R1 arranged in the position of the water outlet of the quick heating body, wherein one end of the temperature sensor R1 is connected with a power supply VCC and the other end thereof is connected with a resistor R2 and a capacitor C1, the other ends of the resistor R2 and the capacitor C1 are grounded, the temperature sensor R1 and the resistor R2 divide the voltage of the power supply VCC and then are connected with the non-inverting input terminal of an operational amplifier (2), and the inverted input terminal of the operational amplifier (2) is connected with the output terminal, so as to form a follower; the output terminal of the operational amplifier (2) is connected with a resistor R3, the other end of the resistor R3 is connected with the non-inverting input terminal of an operational amplifier (3), the inverted input terminal of the operational amplifier (3) is connected with a resistor R4 and a resistor R5, the other end of the resistor R4 is grounded, the other end of the resistor R5 is connected with the output terminal of the operational amplifier (3), and the output terminal of the operational amplifier (3) is connected with the AD port of the single chip microcomputer (1); and the voltage between the temperature sensor R1 and the resistor R2 is amplified and then subjected to the A/D conversion and the detection by the single chip microcomputer (1), and the temperature of the temperature sensor R1 is calculated. The temperature measuring circuit has the benefits of accurately measuring the temperature of the heating body by adopting the simple hardware structure with low hardware cost and achieving better temperature-control effect.
Description
Technical field
The utility model relates to the temperature sensing circuit of the instant heating type heating body of coffee making apparatus.
Background technology
Influencing the important elements of coffee quality, is exactly the temperature of hot water.Temperature is low excessively, the coffee brewing poor effect, and taste is light partially, on the contrary temperature is too high, causes coffee taste bitter excessively, even the smell of burning is arranged.Generally adopt the NTC thermistor as temperature sensor at present, detect the calandria temperature, be placed on position near the calandria rising pipe.By control calandria temperature, control leaving water temperature.Therefore the calandria temperature detection is most important.At present, generally adopt temperature sensor and precision resistance that supply voltage is carried out dividing potential drop after, directly detect by single-chip microcomputer, and calculate sensor temperature, such mode is by two point defects, and the one, signal is not isolated through the amplifier amplifier of high impedance, is interfered easily; The 2nd,, through amplifying, accuracy of detection is not high for signal.
Summary of the invention
The present invention seeks to overcome above-mentioned shortcoming, adopt simple hardware construction and cheap hardware cost, obtain accurately to detect the effect of calandria temperature, realize preferable temperature control effect.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of temperature sensing circuit of coffee machine instant heating type heating body, comprise the single-chip microcomputer 1 of carrying out detection algorithm, be installed in the temperature sensor R1 of instant heating type heating body water delivering orifice position, described temperature sensor R1 one end connects power supply VCC, other end resistance R 2 and capacitor C 1, the other end ground connection of described resistance R 2 and capacitor C 1, described temperature sensor R1 and resistance R 2 with power supply VCC dividing potential drop after, the in-phase end of concatenation operation amplifier 2, the inverting input of described operational amplifier 2 connects output terminal, forms a follower; The output terminal of described operational amplifier 2 connects resistance R 3, the in-phase input end of described resistance R 3 other end concatenation operation amplifiers 3, the inverting input of described operational amplifier 3 connects resistance R 4, resistance R 5, described resistance R 4 other end ground connection, the output terminal of the described operational amplifier 3 of described resistance R 5 another terminations, the output terminal of described operational amplifier 3 connects the AD port of described single-chip microcomputer 1;
The resistance of described temperature sensor R1 varies with temperature, and described resistance R 2 is accurate fixed resistance; The voltage that described temperature sensor R1 and resistance R are 2 after amplifying, is detected by the AD conversion by described single-chip microcomputer 1, and calculates the temperature of described temperature sensor R1.
Description of drawings
Fig. 1 is the temperature measuring circuit schematic diagram of coffee machine instant heating type heating body;
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1, a kind of temperature sensing circuit of coffee machine instant heating type heating body, comprise the single-chip microcomputer 1 of carrying out detection algorithm, be installed in the temperature sensor R1 of instant heating type heating body water delivering orifice position, temperature sensor R1 one end connects power supply VCC, other end resistance R 2 and capacitor C 1, the other end ground connection of described resistance R 2 and capacitor C 1.
Temperature sensor R1 is the NTC thermistor, and its resistance varies with temperature, and resistance R 2 is accurate fixed resistance.Therefore, the voltage that temperature sensor R1 and resistance R are 2 also varies with temperature.
Temperature sensor R1 and resistance R 2 with power supply VCC dividing potential drop after, the in-phase end of concatenation operation amplifier 2, the inverting input of operational amplifier 2 connects output terminal, forms a follower, this follower has the high characteristics of input impedance, can avoid the influence of follow-up amplifying circuit to signal source; The output terminal of operational amplifier 2 connects resistance R 3, the in-phase input end of resistance R 3 other end concatenation operation amplifiers 3, the inverting input of operational amplifier 3 connects resistance R 4, resistance R 5, resistance R 4 other end ground connection, the output terminal of the described operational amplifier 3 of resistance R 5 another terminations.The gain of operational amplifier 3 is G=(1+R5/R4).
The output terminal of operational amplifier 3 connects the AD port of single-chip microcomputer 1.Temperature signal is detected by the AD conversion by single-chip microcomputer 1, and calculates the temperature of temperature sensor R1 through after amplifying.
Claims (3)
1. the temperature sensing circuit of a coffee machine instant heating type heating body, comprise the single-chip microcomputer (1) of carrying out detection algorithm, be installed in the temperature sensor R1 of instant heating type heating body water delivering orifice position, described temperature sensor R1 one end connects power supply VCC, other end resistance R 2 and capacitor C 1, the other end ground connection of described resistance R 2 and capacitor C 1, it is characterized in that: described temperature sensor R1 and resistance R 2 with power supply VCC dividing potential drop after, the in-phase end of concatenation operation amplifier (2), the inverting input of described operational amplifier (2) connects output terminal, forms a follower; The output terminal of described operational amplifier (2) connects resistance R 3, the in-phase input end of described resistance R 3 other end concatenation operation amplifiers (3), the inverting input of described operational amplifier (3) connects resistance R 4, resistance R 5, described resistance R 4 other end ground connection, the output terminal of the described resistance R described operational amplifiers of 5 another terminations (3), the output terminal of described operational amplifier (3) connects the AD port of described single-chip microcomputer (1);
2. the temperature sensing circuit of a kind of coffee machine instant heating type heating body as claimed in claim 1, it is characterized in that: the resistance of described temperature sensor R1 varies with temperature, and described resistance R 2 is accurate fixed resistance.
3. the temperature sensing circuit of a kind of coffee machine instant heating type heating body as claimed in claim 1, it is characterized in that: the voltage that described temperature sensor R1 and resistance R are 2, after amplifying, detect by the AD conversion by described single-chip microcomputer (1), and calculate the temperature of described temperature sensor R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301894U CN201382823Y (en) | 2009-04-03 | 2009-04-03 | Temperature measuring circuit of quick heating body of coffee machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301894U CN201382823Y (en) | 2009-04-03 | 2009-04-03 | Temperature measuring circuit of quick heating body of coffee machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201382823Y true CN201382823Y (en) | 2010-01-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920301894U Expired - Fee Related CN201382823Y (en) | 2009-04-03 | 2009-04-03 | Temperature measuring circuit of quick heating body of coffee machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201382823Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575056A (en) * | 2013-11-04 | 2014-02-12 | 合肥美的电冰箱有限公司 | Control method and temperature detection method of refrigerator |
| CN107529233A (en) * | 2017-08-14 | 2017-12-29 | 电子科技大学 | A kind of heating and temperature measurement circuit based on RTD |
-
2009
- 2009-04-03 CN CN200920301894U patent/CN201382823Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575056A (en) * | 2013-11-04 | 2014-02-12 | 合肥美的电冰箱有限公司 | Control method and temperature detection method of refrigerator |
| CN107529233A (en) * | 2017-08-14 | 2017-12-29 | 电子科技大学 | A kind of heating and temperature measurement circuit based on RTD |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100113 Termination date: 20110403 |